Keep your feet warm on the coldest of days with these Heat Holders Mens Captain America Slipper Socks. Designed for ultimate comfort and thermal performance, these socks boast a thick, chunky knit with a high tog rating of 2.34, thanks to a specially developed heavy bulk yarn. The long pile cushioning provides exceptional comfort and support. For safety and stability on indoor surfaces like wood or tile, the socks feature non-slip grippers on the bottom. Please note, slipper socks are not recommended for use inside shoes or boots. These officially licensed socks are machine washable at 40°C and are made from a blend of 91% Acrylic, 5% Nylon, 3% Polyester, and 1% Elastane. Additional features include diabetic-friendly design and crew sock length.